doublegunshop.com - home Forums General Discussion Classic & Custom Single Barreled Sporting Rifles @ doublegunshop.com unusual bolt treatment

Bill has the answer,the operator quit too soon.I think it would look nicer with a little more coverage.

well, things are busy here, we have 2.5 year old twins.

So here is a link to the rifle on the auction site

Mauser 30-06

On one hand having high resolution images tends to make
things look worse, on the other hand, I do believe the pictures
show clues to how it was done. I still don't believe it was scraping. But I will give people some more time before I offer my opinion.

You could not go wrong, if the Lyman Alaskan scope is decent they usually go for around $200 on ebay.

The scraping looks like the work of John Oberlies or similar. Unfortunately, the rifle was not built by Oberlies.

looks like good scraping to me, function is whats important.the idea is for a smooth bolt travel.jeweling is an easy and inexpensive way to do the job.mc

This is slightly off the beaten track, but is this scraping and jewelling truly effective or is this just part of the gun-culture mystique? I can't see why making something rougher is a good way to make something smoother. I don't see this being done to bearings for instance.

I apologize for side tracking a little here, but this has always mystified me. Makes no sense at all that I can see.

jeweling or scraping not only holds oil better reducing friction, but it also reduces surface area contact reducing surface tension/drag.

Kind of along the lines of the hulls on race boats. Most racers will scuff up the hull where it meets the water, not polish it smooth and wax.

Bearings don't apply to this theory as they roll instead of drag.

gunmaker, I know that is the reason given for jeweleing, but does it actually work? Again, I never see such surfaces in other friction-reducing applications such as a bearings or rails made for sliding metal against metal. I can't feel any difference either. But I don't have any particularly objective data to offer in support of anyone's claim one way or the other.

very common on the ways of a milling machine....

It is not neccesary for proper function. In the great majority of cases, it is for appearance. John Oberlies scraped large, non functional areas like Hi Wall breech blocks, levers, hammers, safeties, you name it. It was a beautiful treatment, but largely decorative, not functional. In conversations with posters on this board, no one has seemed to be able to figure out how Oberlies did it.